There’s a common saying in the EDC scene: “two is one, one is none.” It stresses the importance of having backup options in your EDC. Besides the obvious mathematical inaccuracy, it can be confusing the first time you hear it: If you already have a tool in your EDC that serves a purpose, why would you need another one?
Simply put, it’s your “Plan B.” Carrying an extra of something you already have and practicing redundancy in that way does two things. Let’s use a knife for example: if you lose it or if you've used it so much it’s gotten too dull to finish the task in front of you, having a backup knife—even if it’s tiny—still lets you make the cut. Secondly, your backup knife could have a different shape or serve a slightly different purpose, giving you that extra versatility.
But here’s the thing about backups. At the end of the day, they’re still another thing you have to carry! That means more weight and less space in your pockets (not to mention, less cash in your wallet).